115 



Pontophilus, Leach. 



Pontophilus, Leach, Malac. Podoph. Brit., pi. xxxvii A. 1815: Spence Bate, Challenger Crustacea Hacrura, 

 p. 486 : Ortmann, Proc. Ac. Nat. Sci. Philad. 1895, p. 182 (part). 



Carapace little compressed : abdomen long. Eyestalks short : eyes of good 

 size. The antennules and antennge arise almost in the same horizontal plane. 

 The scale on the outer side of the basal joint of the antennule is styliform : 

 antennular flagella short. Antennal scale long and of only moderate breadth. 



In all three pairs of maxillipeds the flagellum of the exopodite is bent 

 strongly inwards. 



1st pair of thoracic legs without an exopodite : 2nd pair chelate, very short 

 — less than half the length of the 1st pair. 



All the abdominal appendages are foliaceous and biramous, the rami being 

 little unequal. In all but the 1st pair there is a small styliform lobe at the base 

 of the endopodite. Eggs of deep-sea species few and large. 



The branchiee are 7 in number on either side as follows : — 



Somites. Podobranchiae. Pleurobranchise. 



Synopsis of the Indian deep-sea species of Pontophilus. 



I. Two spines on the median carina of the carapace, one gastric the other 



cardiac ... ... ... ... ... ... P. gracilis. 



II. Three spines on the median carina of the carapace, two gastric, the 



third cardiac ... ... ... ... ... P. abyssi. 



67. Pontophilus gracilis, S. I. Smith. 



Pontophilus gracilis, S. I. Smith, Bull. Mus. Comp. Zool. X. 1882, p. 36, pi. vii. figs. 2-3a, and Rep. U. S. Fish. 

 Comm. for 1885, pi. xi. figs. 1-2 : Wood-Mason, Ann. Mag. Nat. Hist. (6) VIII. 1891, p. 361 : Ortmann, Proc. 

 Acad. Nat. Sci. Philad. 1895, pp. 183, 186. 



Kostrum very slender throughout, reaching at least to the ends of the eyes, 

 with a spinule on either side not far from its base. 



Besides the orbital and post-antennal spines —the latter of which ends in 

 advance of the tip of the rostrum — there are six spines on the carapace, namely, 

 an hepatic and an epibranchial on either side, and a gastric and a cardiac in the 



